Fiber guiding plate for a rotary spinning chamber of an open end spinning machine

ABSTRACT

A rotary spinning chamber for an open end spinning machine having a fiber introducing channel and a sector shaped guiding plate stationarily arranged for separting the spinning chamber into a fiber feeding part and a yarn withdrawing part.

United States Patent [1 1 Urifu et al.

[ 51 Sept. 30, 1975 FIBER GUIDING PLATE FOR A ROTARY SPINNING CHAMBER OF AN OPEN END SPINNING MACHINE Inventors: Tooru Urifu, ltami; Tsutomu Miyazaki, Kariya, both of Japan Assignees: Kaiwa Boseki Kabushiki Kaisha,

Osaka; Kabushiki Kaisha Toyoda, Kariya, both of Japan Filed: July 8, 1974 Appl. No.: 486,456

Foreign Application Priority Data Sept. 19, 1973 Japan 48-105766 US. Cl 57/5839; 57/5895 Int. Cl D0lh 1/12 Field of Search 57/34 R, 58.89-58.95

References Cited UNITED STATES PATENTS 9/1967 Ripka et al. 57/5889 3,357,168 12/1967 Zlcvor et a1. 57/5889 3,399,523 9/1968 Ripka ct al. 57/5889 X 3,511,042 5/1970 Seidov et a1. 1. 57/5889 3,521,440 7/1970 Oskin er a1 57/5889 3,624,994 12/1971 Rohlena (:1: 11.... 57/5891 3,688,487 9/1972 Fukuta 57/5895 3,698,175 10/1972 Dykast 57/5889 Prinmry E.\'uminerD0na1d E. Watkins Attorney, Agent, or Firm-Wenderoth, Lind & Ponack 57 ABSTRACT I A rotary spinning chamber for an open end spinning machine having a fiber introducing channel and a sector shaped guiding plate stationarily arranged for separting the spinning chamber into a fiber feeding part and a yarn withdrawing part.

6 Claims, 7 Drawing Figures U.S. Patent Sept. 30,1975 Sheet 1 of 3 3,908,349

US. Patent Sept. 30,1975 Sheet 2 of 3 3,908,349

U.S. Patent Sept. 30,1975 Sheet 3 of3 3,908,349

FIBER GUIDING PLATE FOR A ROTARY SPINNING CHAMBER OF AN OPEN END SPINNING MACHINE The present invention relates to an open end spinning machine having a spinning chamber rotated at a high speed and a fiber introducing channel directed toward and opening into the spinning chamber, and more particularly, to a fiber guiding plate stationarily arranged in the spinning chamber to guide the fibers separated by a fiber-separating mechanism to the inner wall surface of the rotary spinning chamber.

As is known in the art, fibers separated by the fiberseparating mechanism such as a combing roller or a draft roller are introduced into the rotary spinning chamber through a fiber introducing channel or pipe directed toward and opening into the rotary spinning chamber by a suction air current or ajet of pressurized air. In order that the fibers introduced into the rotary spinning chamber may be guided to the inner wall surface of the rotary Spinning chamber without interfering with the spun yarn being withdrawn from the spinning chamber, a fiber guiding plate in the form of a circular plate or cone is disposed stationarily within the spinning chamber to substantially divide the interior of the spinning chamber into a fiber feeding part and a yarn withdrawing part, and the back face of said plate opposed to the outlet opening of the fiber introducing channel is used as guide means for guiding the fibers onto the inner wall surface of the spinning machine.

However, since the fiber guiding plate extends, as de scribed above, to substantially bisect the interior of the spinning chamber into said two parts, said fiber feeding part of the spinning chamber is subjected to little effect of a rotational air current produced by the high speed rotation of the spinning chamber, so that there is creatcd a disturbed air current (reverse current or stagnation of air), with the result that while most of the fibers discharged together with air toward the back face of said fiber guiding plate from the outlet opening of the fiber introducing channel are carried in the direction of rotation of the spinning chamber, the remaining part of the fibers move in the reverse direction in said fiber feeding part of the spinning chamber and they stagnate therein. This interferes with the straightening of fibers and causes part of the fibers to be formed with hooks before the fibers reach the inner wall surface of the spinning chamber, thus lowering the quality of spun yarn.

In order to overcome such difficulties, it may be contemplated that the outer diameter of the fiber guiding plate relative to the inner diameter of the spinning chamber is decreased to allow as many fibers as possible to follow the direction of rotation of the spinning chamber after they have been discharged from the fiber introducing channel. However, by decreasing the outer diameter of the fiber guiding plate, on the one hand, the fiber guiding function of the fiber guiding plate is receded and on the other hand the division of interior of the spinning chamber into said fiber feeding part and yarn withdrawing part becomes not substantial so that there occurs the problem of the fibers discharged from said channel directly interfering with the yarn being spun to lower the quality of the spun yarn.

An object of the present invention is to overcome said difficulties by providing a fiber guiding plate which is so configurated that the rotational air current produced by the high speed rotation ofa spinning chamber is introduced into said fiber feeding part from said yarn withdrawing part of the spinning chamber to regulate the direction of air currents in said fiber feeding part of the spinning chamber so that all the fibers discharged from the outlet opening of the fiber introducing channel are guided in the same direction toward the inner wall surface of the spinning chamber while they are straightened by being accelerated by means of the high speed rotational air current.

Thus, in accordance with the present invention, there is provided a fiber guiding plate which is substantially in the form of a sector and is stationarily arranged in the spinning chamber with the rear end portion thereof being opposed to said outlet opening of the fiber introducing channel.

According to another feature of the present invention, there is provided a fiber guiding plate which is composed of a first guiding portion of relatively large radius and having substantially sector shape and a second guiding portion of relatively small radius and having substantially sector shape which extends forwardly from the forward edge of said first guiding portion. The fiber guiding plate is stationarily arranged in the spinning chamber with the rear end portion of said first guiding portion being opposed to the outlet opening of the fiber introducing channel.

The present invention will be better understood from the following description taken in connection with the accompanying drawings in which:

FIG. 1 is a vertical sectional view of a spinning portion of an open end spinning machine;

FIG. 2 is a diagramatical bottom view showing air current distribution in the yarn feeding part of the spinning chamber shown in FIG. 1; 7

FIG. 3 is a bottom view showing an embodiment of the present invention;

FIG. 4 is a bottom view showing another embodiment of the present invention;

FIG. 5 is a perspective view showing further embodiment of the present invention;

FIG. 6 is a bottom view showing a still further embodiment of the present invention; and

FIG. 7 is a bottom plan view showing how the fiber guiding plate of the present invention is stationarily arranged in the spinning chamber relative to the outlet opening of the fiber introducing channel.

Referring now to the drawings and more particularly to FIG. 1, there is illustrated a spinning portion of an open end spinning machine having a conventional fiber guiding plate.

The reference numeral 1 designates a block in which a feed roller 2 and a combing roller 3 is rotatably mounted. These rollers are rotatively driven in the direction shown by the arrows from a driving source (not shown in the drawings). The fibers 4 are pressed against the periphery of the feed roller 2 by means of a presser 5 and fed to the combing roller 3 where the fibers 4 are separated or combed.

The reference numeral 6 designates a fiber introducing channel which is directed toward and opening into a spinning chamber 7 which is rotatively driven at a high speed from a driving source (not shown in the drawings). The fibers combed by the combing roller 3 are entrained by the air stream flowing in said channel 6 toward the back surface 10 of a circular fiber guiding plate 9 which is stationarily arranged in the spinning chamber 7 and divides the interior of the spinning chamber 7 into a fiber feeding part 11 adjacent to the outlet opening 8 of the fiber introducing channel 6 and a yarn withdrawing part 12 on the opposite side.of the plate 9. The discharged fibers are guided by means of the fiber guiding plate 9 onto the inner wall surface 13 of the spinning chamber 7 and gathered together at the largest inner diameter portion 14 and successively withdrawn by meansof withdrawing rollers 16 as a yarn 15 from the yarn withdrawing part 12 of the spinning chamber 7. The yarn I withdrawn by the rollers 16 is suitably taken up as shown by the reference numeral 17.

The fiber guiding plate 9 serves to guide the continuously fed fibers to the inner wall surface 13 of the spinning chamber 7 without directly interfering with the yarn being withdrawn. As is known in the art, the fiber guiding plate 9 is usually in the form of a circular plate or a trumpet and substantially divides the interior of the spinning chamber 7 into two parts 11 and 12 as described above, so that as described above, the rota tional air current as produced in said yarn withdrawing part 12 by the high speed rotation of the spinning chamber 7 can not well advance into said fiber feeding part 11 due to the existence of the fiber guiding plate 9 therebetween.

An observation has revealed that air currents shown in FIG. 2 coexist in the fiber feeding part 11 of the spfiining chamber during spinning operation. As is seen from FIG. 2, around the outlet opening 8 of the fiber introducing channel 6, most of the air discharged from said channel 6 is flowing most strongly in the direction of rotation of the spinning chamber 7 but the rest is flowing in the opposite direction. The air current flowing in the opposite direction interfers with a weak rotational air current in said fiber feeding part 11, resulting in a local stagnation ,of the air in said fiber feeding part 11. As described above, such stagnation of the air leads to a cause of the undesirable result that the flow speed of fibers immediately after coming out of the outlet opening 8 of the fiber introducing channel 6 is decreased so that a part of the fibers are bent or they stagnate, bringing about an unfavorable result that the quality of spun yarn is lowered.

Now referring to FIGS. 3 and 4, there are illustrated basical embodiments of the present invention.

As shown in FIGS. 3 and 4, the fiber guiding plate 9 is substantially in the form of a sector. The arc length L of the periphery of the sector is determined by such factors as staple length and the rpm. of the spinning chamber 7, but it is preferably selected from the following range:

wherein r is the radius of the sector.

Thus, FIG. 3 shows a fiber guiding plate 9, the arc length L of the sector thereof is wr/Z, and FIG. 4 shows a fiber guiding plate 9, the arc length L of the sector thereof is 31rr/2.

For ordinary cotton fibers, the fiber guiding plates 9 shown in FIGS. 5 and 6 are advantageously used.

The fiber guiding plate 9 of FIGS. 5 and 6 is constituted by a first guiding portion 91 of relatively large radius r, and having substantially sector shape and a second guiding portion 92 of relatively small radius r and having substantially sector shape which extends forwardly from the forward edge 93 of said first guiding portion 91 as viewed in'the direction of rotation of the spinning chamber 7.

Said second guiding portion 92 may continuously extend from the forward edge 93 to the rear edge 94 of said first guiding portion 91 as shown in FIG. 5 or may terminate short of the rear edge 94 of said first guiding portion 92 as shown in FIG. 6.

The fiber guiding plate 9 according to the present invention is stationarily arranged in the spinning chamber 7, as shown in FIG. 7, with the rear end portion thereof being opposed to the.0utlet opening 8 of the fiber intro ducing channel 6.

The radius r of said first guiding portion 91 may be substantially same as that of the prior known fiber guiding plate, while the radius r of said second guiding portion 92 is preferably selected from the following range:

wherein R is the maximum inner radius of the spinning chamber 7 (see FIG. 1).

In accordance with a preferable feature of the present invention, the forward edge 93 of said first guiding portion 91 is extended forwardly as the periphery of said portion 91 is approached as shown in FIG. 6 by a dot and dash line 95. This contributes to enhance the fiber guiding function of said first guiding portion 91.

Such construction, i.e. the forward extension of the forward edge 93 can be applied also to the fiber guiding plate of FIGS. 3, 4 and 5 to enhance the fiber guiding function thereof.

Here, it should be noted that the terms forward" and rear" as appearing in this specification are de scribed according to the direction of rotation of the spinning chamber 7, and hence to the direction of rotation of said rotational air current.

The operation of an open end spinning machine em-.

ploying the sector-shaped fiber guiding plate 9 of the present invention will now be described.

As described hereinbefore, the fiber guiding plate 9 of the present invention is stationarily arranged inthe spinning chamber 7 with the rear end portion thereof being opposed to the outlet opening 8 of the fiber introducing channel 6. Thus the portion of said fiber feeding part 11 at the upstream of the outlet opening 8 of the fiber introducing channel 6 as viewed in the direction of said rotational air current is not covered by the fiber guiding plate 9, and, therefore, directly communicated with said yarn withdrawing part 12. Thus, the rotational air current as produced in the yarn withdrawing part 12 by the high speed rotation of the spinning chamber 7 well advances into the portion of the fiber feeding part 11 which is covered by the fiber guiding plate 9 through the rear end portion thereof. Such rotational air current as advanced or entered into the fiber feeding part 1]. acts on the fibers discharged from the outlet opening 8 of the fiber introducing channel 6, whereby all the fibers discharged from said outlet opening 8 are entrained by the rotational air current and guided by means of the sector-shaped guiding plate 9 toward the inner wall surface 13 of the spinning chamber 7, while they are straightened by the rotational air current having a greater speed than the air flow speed in the fiber introducing channel 6.

On the other hand, the prevention of the interference of the fibers discharged into the fiber feeding part 11 of the spinning chamber 7 upon the yarn 15 being withdrawn is ensured since the fibers are thrown onto the inner wall surface 13 of the spinning chamber 7 only in the region covered by the fiber guiding plate 9.

While the principles of the invention have been described above in connection with specific embodiments, and particular modifications thereof, it is to be clearly understood that this description is made only by way of example and not as a limitation on the scope of the invention.

What is claimed is:

l. A fiber guiding plate for dividing interior of a rotary spinning chamber of an open end spinning machine having in addition to said rotary spinning chamber a fiber introducing channel directed toward and opening into said spinning chamber, into a fiber feeding part adjacent to an outlet opening of said fiber introducing channel and a yarn withdrawing part on the opposite side of the fiber guiding plate, characterized in that said fiber guiding plate is substantially in the form of a sector and is stationarily arranged in said spinning chamber with the rear end portion thereof being op posed to said outlet opening of said fiber introducingchannel.

2. A fiber guiding plate as claimed in claim 1, wherein the forward edge of the sector is extended for wardly as the periphery of the sector is approached.

3. A fiber guiding plate for dividing interior of a rotary spinning chamber of an open end spinning machine having in addition to said rotary spinning chamber a fiber introducing channel directed toward the opening into said spinning chamber, into a fiber feeding part adjacent to an outlet opening of said fiber introducing channel and a yarn withdrawing part on the opposite side of the fiber guiding plate, characterized in that said fiber guiding plate is composed of a first guiding portion of relatively large radius and having substantially sector shape and a second guiding portion of relatively small radius and having substantially sector shape which extends forwardly from the forward edge of said first guiding portion, and is stationarily arranged in said spinning chamber with the rear end portion of said first guiding portion being opposed to said outlet opening of said fiber introducing channel.

4. A fiber guiding plate as claimed in claim 3, wherein the forward edge of said first guiding portion is extended forwardly as the periphery of said first guiding portion is approached.

5. A fiber guiding plate as claimed in claim 3, wherein said second guiding portion is continuously extending from the forward edge to the rear edge of said first guiding portion.

6. A fiber guiding plate as claimed in claim 3, wherein said second guiding portion terminates short of the rear edge of said first guiding portion.

* l= l l 

1. A fiber guiding plate for dividing interior of a rotary spinning chamber of an open end spinning machine having in addition to said rotary spinning chamber a fiber introducing channel directed toward and opening into said spinning chamber, into a fiber feeding part adjacent to an outlet opening of said fiber introducing channel and a yarn withdrawing part on the opposite side of the fiber guiding plate, characterized in that said fiber guiding plate is substantially in the form of a sector and is stationarily arranged in said spinning chamber with the rear end portion thereof being opposed to said outlet opening of said fiber introducing channel.
 2. A fiber guiding plate as claimed in claim 1, wherein the forward edge of the sector is extended forwardly as the periPhery of the sector is approached.
 3. A fiber guiding plate for dividing interior of a rotary spinning chamber of an open end spinning machine having in addition to said rotary spinning chamber a fiber introducing channel directed toward the opening into said spinning chamber, into a fiber feeding part adjacent to an outlet opening of said fiber introducing channel and a yarn withdrawing part on the opposite side of the fiber guiding plate, characterized in that said fiber guiding plate is composed of a first guiding portion of relatively large radius and having substantially sector shape and a second guiding portion of relatively small radius and having substantially sector shape which extends forwardly from the forward edge of said first guiding portion, and is stationarily arranged in said spinning chamber with the rear end portion of said first guiding portion being opposed to said outlet opening of said fiber introducing channel.
 4. A fiber guiding plate as claimed in claim 3, wherein the forward edge of said first guiding portion is extended forwardly as the periphery of said first guiding portion is approached.
 5. A fiber guiding plate as claimed in claim 3, wherein said second guiding portion is continuously extending from the forward edge to the rear edge of said first guiding portion.
 6. A fiber guiding plate as claimed in claim 3, wherein said second guiding portion terminates short of the rear edge of said first guiding portion. 